Furnace wall



March, 22, 1938. J, s BENNETT 2,111,605

FURNACE WALL Filed NOV. 21, 1935 2 Sheets-Sheet l [7/ 2 1 4601 9? 45: Z/mei-Z wef March 22, 1938. J, s ENN 2,111,605

FURNACE WALL Filed NOV. 21, 1935 2 Sheets-Sheet 2 V 1/ j g I? 01x30 V 6 I76 1% @MZZQ Patented Mar. 22, 1938 UNITED STAT FURNACE WALL a corporation of Pennsylvania Application November 21, 1935, Serial No. 50,834

5 Claims.

This-invention relates to furnace walls, and more particularly to furnace walls of the fluid cooled type. One object of the present invention is to provide in furnace walls of the stated character, generally improved means for diverting the molten slag flowing down the walls away from" the portions thereof adjacent the fuel bed.

A more specific object is to provide in fluid cooled walls of the vertical tube type, slag diverting means consisting of one or more fluid conducting tubes for diverting the molten slag flowing down the walls away from the lower areas thereof adjacent the fuel bed.

Other and further objects will become apparent as the description of the invention progresses.

Of the drawings:

Fig. 1 is a longitudinal sectional view taken through a boiler furnace, showing the preferred embodiment of my invention applied to one of the side walls thereof.

. Fig. 2 is an end sectional view taken substan tially along line 22 of Fig. 1.

Fig. 3 is an end View partly in. section taken along line 33 of Fig. 1, and

Fig. 4 is a longitudinal sectional view taken through a boiler furnace showing a modified construction.

Referring to the drawings, the numeral I designates generally a furnace comprising a boiler 2 fired by a multiple retort underfeed stoker 3 of a well known type. Boiler 2 is of a well known construction and consists of a lower drum 4, and upper steam drums 5, 6 and l interconnected by pipes 8 and 9. Drums 5, 6 and l are respectively connected to the lower drum lby the usual pipes Ill, II and I2. The combustion chamber I3 of the furnace is bounded by front and rear water walls I4 and I5 respectively, and side walls IS. The tubes I! of front wall I4 terminate at their lower ends in a header I8 disposed above the stoker 3. The upper ends of tubes I'I form an arch I9 and terminate in steam drum I. The tubes 20 of rear wall I5 terminate at their lower ends in a header 2|, and at the upper ends thereof in drum 4. A downtake connection 22, connecting header 2| to drum 4, completes the circulatory system for the rear water wall I5. The side Walls I6 comprise a series of vertically disposed tubes 23 connected at one end to an upper header 24 and at the other end to a lower header 25 disposed beneath the stoker. The side wall I6 also comprises a series of longer tubes 26 connected at their upper ends to header 24 and at their lower ends to a header 21 disposed adjacent the lower end of the ash pocket 28 at the rear of stoker 3.

power mechanism indicated at 34.

'struction.

Header 24 is connected to boiler drums 3 and I by a series of uptake connections 29, while headers 25 and 2! are connected to the lower drum 4 of the boiler by downtake connections 30 and 3I respectively.

Stoker 3 is of usual construction, and consists of a combustion grate 32 to which fuel from a hopper 33 disposed at the front of the stoker is fed by any suitable feeding means driven by a The usual extension grates 35 are provided toward the rear end of the stoker which feed the consumed fuel into the ash pocket 28. The portion of the side wall I6 adjacent the stoker and ash pocket may be provided with protective blocks 36 to protect the tubes against the abrasive action of the fuel. These blocks also present a smooth continuous surface to the fuel bed. Portions of the front and rear walls I4 and I5 respectively may likewise be provided with protective blocks if it is so desired. In order to prevent slag from coating the area of the side walls adjacent the'stoker or ash pocket a series of slag diverting tubes 31 are provided. These tubes are connected at their upper ends to the right hand end of header 24 and incline downwardly toward the rear of the furnace in substantially parallel relation with stoker 3 and terminate at their lower ends in header 21. These tubes lie in substantially abutting relation with the vertical tubes 23 and 26 of wall I6, and are disposed slightly above'the block covered areas thereof. It therefore is seen. that any slag flowing down the wall will engage tubes 31 and be diverted away from the block covered area thereof and into the fuel bed supported on stoker 3. Partitions or baffles 38 and 39 may be provided in header 23 between tubes 23 and 26, and between tubes 23 and 3! respectively, if it is so desired, to insure proper circulation in the system.

Fig. 4 shows a somewhat modified side Wall con- As therein shown, the side wall I6 consists of a series of substantially vertical tubes 23 connected at their upper ends to an upper header 24' and at their lower ends to a lower header 25, and a series of longer tubes 26' connected at their upper ends to header 24' and at the lower ends thereof to a header 21'. In this construction a single tube 31' is provided to divert the molten slag flow down the wall away from the lower areas thereof. This tube comprises a vertical portion 48 connected at the upper end thereof to the header 24', an inclined portion II disposed above the stoker 3' and in substantially parallel relation therewith, and a second vertical portion 42 disposed at the extreme left hand side of the ash pocket 28' which terminates at the lower end thereof in header 21. In certain installations it might be desirable to provide bare tubes throughout, as shown in Fig. 4. However, by providing a slag diverting tube such as 31 any slag flowing down the wall is diverted away from the areas thereof adjacent the stoker and ash pocket, and as a result no slag formations will occur on the tubes disposed adjacent those areas.

The slag diverting means provided on the walls of the furnace just described, are simple in construction and form a portion of the steam generating system. The headers for the side walls proper are also utilized to accommodate the tubes of the slag diverting means.

1 The constructions herein described therefore are not only eflicient in operation, but are economical in manufacture.

While the embodiments herein described are admirably adapted to fulfill the objects primarily stated, it is to be understood that the invention is not to be limited thereto since it may be embodied in other forms, all coming within the scope of claims which follow.

What is claimed is:

1. In a furnace. the combination with an in clined grate stoker, of an ash pocket disposed at one end of said stoker, a wall disposed in substantially abutting relation to said stoker and ash pocket, said wall comprising a series of substantially vertical tubes, upper and lower headers for said tubes, a series of protective blocks for said tubes covering the areas thereof adjacent said stoker and ash pocket, and means comprising one or more tubes operatively connected to said headers and having a portion thereof disposed above said block covered area and lying in substantially abutting relation with said vertical tubes for diverting any molten slag flowing down said wall away from the block covered area thereof, and a portion of said last mentioned tubes lying in substantially parallel relation with said stoker.

2. In a device of the class described, the combination with a furnace wall comprising a series of substantially vertical fluid conducting tubes,

of substantially horizontal upper and lower headers for said tubes, one or more fluid conducting tubes connected to and depending from one end of said upper header and extending transversely of said first mentioned tubes and lying in substantially abutting relation therewith for diverting any molten slag flowing down said wall away from the lower extremities thereof, said last mentioned tubes terminating at the lower ends thereof in said lower header, and means for supplying fluid to said lower header.

3. In a device of the class described, the com bination with a furnace wall comprising a series of substantially vertical fluid conducting tubes,

of upper and lower substantially horizontal headers for said tubes, protective blocks mounted on the lower portions of said tubes, one or more fluid conducting tubes connected to and depending from one end of said upper header and extending transversely of said first mentioned tubes above the block covered portion thereof, and lying in substantially abutting relation with respect to said tubes first named, for diverting any molten slag flowing down said wall away from the block covered portions thereof, said last mentioned tubes terminating at the lower ends thereof in said lower header, and means for supplying fluid to said lower header.

4. In a furnace, the combination with an inclined grate stoker, of a wall disposed in substantially abutting relation with said stoker, said wall comprising a series of substantially vertical fluid conducting tubes, substantially horizontal upper and lower headers for said tubes, a series of protective blocks for said tubes covering the areas thereof adjacent said stoker, one or more fluid conducting tubes connected to and depending from one end of said ,upper header and extending transversely of said first mentioned tubes above the block covered area thereof and lying in substantially abutting relation with respect to said tubes first named, whereby any molten slag flowing down said wall will be diverted away from the block covered area thereof and onto said stoker, said last mentioned tubes terminating at the lower ends thereof in said lower header, and means for supplying fluid to said lower header.

5. In a furnace, the combination with an inclined grate stoker, of an ash pocket disposed at one end of said stoker, a wall disposed in substantially abutting relation with said stoker and ash pocket, said wall comprising a series of substantially fvertical fluid conducting tubes, an upper header for all of said tubes, a lower header for the said tubes lying adjacent said stoker, and a second lower header for the said tubes lying adjacent said ash pocket, a series of protective blocks for said tubes covering the areas thereof adjacent said stoker and ash pocket, one or more fluid conducting tubes secured to and depending from one end of said upper header, and extending transversely of said first mentioned tubes in substantially parallel relation with said stoker, said last mentioned tubes lying in substantially abutting relation with said first mentioned tubes and above the block covered areas thereof, whereby any molten slag flowing down said wall will be diverted away from the block covered area thereof and onto said stoker, said last mentioned tubes terminating at the lower ends thereof in said second mentioned lower header, and means for supplying fluid to said. lower headers.

JOSEPH S. BENNETT. 

